Process of coking.



, UNITED STATES Patented. January 3, 1905.

PATENT OEEIcE.

i= RocEss OF COKING.

SPECIFICATION forming part of Letters Patent No. 778,846, dated January 3, 1905.

Application filed May 21, 1903. Serial No. 158,178.

To all w/wm it may concern.-

Be it known that I, ALPHONS GUSTODIS, a citizen of the German Empire, and a resident of Dusseldorf, Germany, have invented certain new and useful Improvements in Coking,

of which the following is a specification.

My invention relates to an improvement in the manufacture of coke; and its object is the removal of certain disadvantages connected with the making of coke from coal mingled with metallic substance.

A disagreeable defect in the process of coking coal mixed with dust from blast-furnaces, refiners smoke, or other metalliferous refuse is the'failure of the coal to develop sufiicient heat for the accomplishment of a fusion of the small metallic particles, and even if those particles do melt they do not combine intensely enough with the coal with which they are loosely mixed, the consequence being an imperfect quality (firmness) of the coke produced. This disadvantage will be obviated by mingling the coal with dust from blastfurnaces and then stamping the mixture into boxes or molds, so that cakes are produced consisting of coal mixed with dust from blastfurnaces. The inner part of solidified cakes producing a larger heat than a loose layer of coalas is well known from experience in coking plain coalall metallic-particles in the cake will melt as desired, and at the same time the metal particles being more tightly inclosed by the coal than would be the case without the stamping will combine and mix more intensely with the latter. The molten metal after having become hard again forms a firm and coherent skeleton, which increases the firmness of the coke produced to a desirable degree.

The dust which I use in the manner above described is the dust which is obtained from blast-furnaces by forcing air through the same and which is known as top dust. This top dust is distinguishable from other metalliferous dust by the constituents which it contains and which it receives from the blast-furnace, as will be seen from the following: In order to extract the iron from iron ores in blastfurnaces, lime is added to the coke-producing substances, which renders the latter meltable. This lime combines with the alumina and silicic acid contained in the ores, thus setting free the iron. It is usual to add forty-five to fifty per cent. lime to thirty-five per cent. silicic acid and ten per cent. alumina. These constituents are present in the top dust in the proportion above mentioned, as may be ascertained by analysis. Owing to the above chemical composition of the top dust, a slag is formed during the coking of the dust, while the iron is reduced to form a sponge.

Before the stamping into the boxes is done the coal should be ground or by any other way comminuted at one time with the dust from blast-furnaces. The purpose of this is to accomplish a good mixture and to overcome the disagreeable circumstance of larger coal particles remaining unpulverized in the mass and unpenetrated by the metal.

What I claim as my invention, and desire to protect by Letters Patent of the United States,

The process of making coke which consists in mixing coal with top dust of blast-furnaces containing iron, lime, silicic acid, and alumina, grinding the mixture, compressing it into cakes, and coking the cakes, whereby a slag is formed and the iron is reduced to form a sponge, substantially as specified.

Signed by me at Dusseldorf, Germany, 6th day of May, 1903.-

ALPHONS CUSTODIS.

this

Witnesses:

WILLIAM ESSENWEIN, PETER LIEBER. 

